Humidifier



FIG. 1 is a rear perspective view of a humidifier showing our new design;

FIG. 2 is a greatly enlarged bottom plan view thereof;

FIG. 3 is an enlarged front elevational view thereof;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is an enlarged right side elevational view thereof; and,

FIG. 6 is an enlarged left side elevational view thereof. 

The ornamental design for a humidifier, as shown. 